# Swarm Chat Tutorial

## Multi-Room Chat

```js
swarm.join(roomTopic)
swarm.on('connection', conn => {
  const mux = new Protomux(conn)
  const chat = mux.channel({protocol: 'chat'})
  chat.msg.onmessage(msg => display(msg))
  chat.open()
})

chat.msg.send('hi room!')
```

**Scale**: Firewall trusted keys.